My son is transitioning to 5T but this 5/6 coat was so small for him that (although it could fit snugly) I don't think it would fit him the whole winter. It is very tight around the neck and it was difficult to zip up without putting the hood on first. We reordered a size 7. It's still tight around the neck but I'm sure it will fit him all winter. My son is 3ft 10" and about 45 pounds. We love the design of the coat and winter pants, plus the colors are great and the design is nice. Again, just that the neck is a little tight - but maybe that's good for snow protection?
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